Huion pen pressure not working in Adobe Illustrator.

Hello, I had the same issue and I found a solution. If you using the Huion tablet make sure that you installed the Huion driver and uninstalled the other driver. Then when you open Adobe Illustrator you need to create a new calligraphy brush with sensitivity and give it a name that you can remember and save it. Each time you want the sensitivity pen you need to find that brush and that's it. I am going to add a Huion website as well. please take a look.

Thank you.

https://support.huion.com/en/support/solutions/articles/44002278970-how-to-setup-pen-pressure-on-adobe-illustrator  

I reinstall the huion driver and work now

Hi, I had the same issue in 2023, but to be honest it was a very quickfix. I deleted the drivers then reinstalled them with illustrator turned off, not sure if you need to do this but it's just something I did. I then opened up illustrator and went to edit, the preferences and scrolled all the way to the bottom and selected devices. It opens up with a Wacom option, mine wasn't ticked so I ticked it. It will only take effect when you close down illustrator and reopen it. So once it is open go to calligraphy pen and double click the brush you want to change or make a new one and select the options you want for  roundness and angle, then on the size click the drop down and you will see pressure is now available. so select whatever variant you want and start drawing. This worked for me on all versions of illustrator even new ones. 

I'm not familiar at all with Huion graphics tablets. Do you know if the tablet requires Windows Ink to be enabled in order for the pen to have pressure sensitive functions in some (or all) applications? I only ask that because that is a BIG problem with Wacom graphics tablets connected to PCs running Windows.

I have a Intuos Pro M tablet hooked up to my Alienware X17 at home. I can only get pressure sensitive functions with this tablet by enabling Windows Ink. But when Windows Ink is enabled much of the computer's functions become very infuriating to use. Basically Windows Ink thinks that any computer with a graphics tablet attached is a mobile phone that has no physical keyboard. It throws handwriting text entry pop-ups in the way at any attempt to click into a text entry box using the pen. I can't even select and highlight text to copy/cut/paste because the cursor functions are changed. The situation is beyond aggravating. 95% of the time I have to use the tablet without any pressure sensitive functions. And in the 5% zone when I'm tempted to try suffering the Windows Ink experience I just end up grabbing my iPad Pro and Apple Pencil and getting all the pressure sensitive drawing functions done there. Microsoft really needs to overhaul Windows Ink. It is TERRIBLE. Microsoft's engineers are completely clueless about this really stupid situation.

Which system is it?

The last time I tried the Huion Kamvas with Illustrator 2019 it worked. This was on Mac OS 10.14.6 and I have a Wacom driver installed.

Installing the Huion driver was jumping through half a dozen hoops and I only managed with the help of Huion support. There are quite some things you have to set up correctly.

Which system is yours? Did you contact their support?